fix: pass pre-read content to RegistryClient for WSL compatibility (#9739)

Fixes #6242, #7810

When Windows VS Code connects to WSL, workspace files are accessed via
vscode-remote:// URIs. Previously, getAllDotContinueDefinitionFiles()
correctly read content via ide.readFile(), but loadYaml.ts discarded
the content and passed only the URI path to RegistryClient, which then
tried to re-read using fs.readFileSync() - failing for remote URIs.

Changes:
- Add optional content field to FileIdentifier (non-breaking)
- RegistryClient.getContent() returns pre-read content when present
- loadYaml.ts passes content along with file identifiers

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

core/config/yaml/loadYaml.ts

@@ -64,6 +64,8 @@ async function loadConfigYaml(options: {
   } = options;
 
   // Add local .continue blocks
+  // Use "content" field to pass pre-read content directly, avoiding
+  // fs.readFileSync which fails for vscode-remote:// URIs in WSL (#6242, #7810)
   const localBlockPromises = BLOCK_TYPES.map(async (blockType) => {
     const localBlocks = await getAllDotContinueDefinitionFiles(
       ide,
@@ -73,6 +75,7 @@ async function loadConfigYaml(options: {
     return localBlocks.map((b) => ({
       uriType: "file" as const,
       fileUri: b.path,
+      content: b.content,
     }));
   });
   const localPackageIdentifiers: PackageIdentifier[] = (

packages/config-yaml/src/interfaces/slugs.ts

@@ -68,6 +68,8 @@ interface FullSlugIdentifier extends BasePackageIdentifier {
 interface FileIdentifier extends BasePackageIdentifier {
   uriType: "file";
   fileUri: string;
+  /** Pre-read content - bypasses fs.readFileSync for vscode-remote:// URIs in WSL */
+  content?: string;
 }
 
 export type PackageIdentifier = FullSlugIdentifier | FileIdentifier;

packages/config-yaml/src/registryClient.test.ts

@@ -131,6 +131,20 @@ describe("RegistryClient", () => {
         "Unknown package identifier type: unknown",
       );
     });
+
+    it("should return pre-read content directly for file with content field", async () => {
+      const client = new RegistryClient();
+
+      const id: PackageIdentifier = {
+        uriType: "file",
+        fileUri: "/nonexistent/path.yaml",
+        content: "pre-read yaml content",
+      };
+
+      // Should return content without trying to read the nonexistent file
+      const result = await client.getContent(id);
+      expect(result).toBe("pre-read yaml content");
+    });
   });
 
   describe("getContentFromFilePath", () => {

packages/config-yaml/src/registryClient.ts

@@ -24,6 +24,11 @@ export class RegistryClient implements Registry {
   }
 
   async getContent(id: PackageIdentifier): Promise<string> {
+    // Return pre-read content if available (for vscode-remote:// URIs in WSL)
+    if (id.uriType === "file" && id.content !== undefined) {
+      return id.content;
+    }
+
     switch (id.uriType) {
       case "file":
         return this.getContentFromFilePath(id.fileUri);